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| Ejaculates (total no. of trials**) |
No. of trials collecting each ejaculate at | |||
| 1st series | 2nd series | 3rd series | additional series | |
| 1st (17) | 14 | 2 | 0 | 1 |
| 2nd (17) | 4 | 11 | 1 | 1 |
| 3rd (16) | 1 | 6 | 4 | 5 |
| ≥4th (14) | 0 | 4 | 2 | 8 |
* A series was composed of more than 2 sets of 10 electrical stimuli. ** In three trials, electrical stimuli finished at second or third ejaculate, because more than 200×106 sperm were collected.
